I don't think that's an issue. Miners would have to follow as well. Coinbase could go fork themselves all they want but even with large custodial holdings they wouldn't have the mind share necessary to make others follow.
To me, people are just upset because he talked rudely about crypto anarchists and went on a weird tangent about selling hardware wallets through fear. Nothing burger.
If 25% of the supply was willing to dumb on the other fork would absolutely mater.
Aside from this being a simplistic example with ooma numbers.
Even if it was 90% supply I still don't think it would ultimately succeed. Bitcoin is an idea that we should follow an agreed upon set of rules and enforce them with computers. If you change Bitcoin it's not Bitcoin, and any breaking change like huge blocks or increased supply would self destruct even if it could achieve a higher market cap for a while.
Maybe I'm being naive/optimistic though.
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